class Sum {
    int n;
    float f() {
      float sum = 0;
      for(int i=1;i<=n;i++) 
      sum=sum+i;
      return sum;
    }
}
class Average extends Sum {
    int n;
    float f() {
      float c;
      super.n = n;
      c = super.f();
      return c/n;
    }
    float g() {
      float c;
      c = super.f();
      return c/2;
    }
}
public class Example5_7 {
    public static void main(String args[]) {
      Average aver = new Average();
      aver.n = 100;
      float resultOne = aver.f();
      float resultTwo = aver.g();
      System.out.println("resultOne:"+resultOne);
      System.out.println("resultTwo:"+resultTwo);
    }
}
